Thomas h



(No Model.)

8 T. H. ANNABLE.

DRILL BIT 0R SIMILAR TOOL.

No. 578,805. Patented Mar. 16, 1897.

any.

WI TNESSES M VE N T0!) Z/WN;

- UNITED STATES I PATENT OFFICE.

THOMAS H. ANNABLE, OF ATTLEBOROUGH, MASSACHUSETTS, ASSIGNOR OF ONE-HALFTO EDWIN E. HALE, OF SAME PLACE.

DRILL-BIT OR SIMILAR TOOL.

SPECIFICATION forming part of Letters Patent No. 578,805, dated March16, 1897.

Application filed June 2, 1896. Serial No. 593,977. (No model.)

To all whom it may concern.-

Be it known that I, THOMAS H. ANNABLE, a citizen of the United States,and a resident of Attleborough, in the county of Bristol and State ofMassachusetts, have invented certain new and useful Improvements inDrill- Bits or Similar Tools, of which the following is a specification,reference being had to the accompanying drawings, forming a partthereof,

in which similar numerals of reference indicate corresponding parts.

This invention relates to drill-bits and similar tools; and the objectthereof is to provide an improved tool or bit which is simple in I 5construction and operation and which is also provided with means wherebya hole when formed by the drill or bit may be enlarged or reamed out atthe sides thereof, a further object being to provide a tool of thisclass whereby the holes formed in stone slabs and similar articles maybe enlarged for the purpose of securing bolts or pins therein.

The invention is fully disclosed in the following specification, ofwhich the accompany- 2 5 ing drawings form a part, in which- Figure 1 isan end view of my improved tool; Fig. 2, a sectional side view thereof;Fig. 3, a central vertical section thereof, and Fig. 4 a sectional sideview showing a modified form of construction.

In the practice of my invention I provide -a drill or bit 5, which ispreferably cylindrical in form and which is provided with an end 6,whereby it may be secured to a stock,

5 brace, or other instrument.

The drill or bit 5 is provided with a drillhead 7, which is preferablyof the form shown, being provided on its opposite sides with two spiralslots or grooves 8, at the bottoms of 0 which are formed cutting edges9, and around the bottom thereof is an annular cutting edge 10.

The head 7 is preferably much larger in diameter thanthe shaft or bodyportion of the 5 bit or drill, and formed in said shaft or body portionis a longitudinal slot 11, in which is mounted a lever 12, which ispivotally supported therein by means of a pin or bolt 13, and the slot11 is carried downwardly into the upper portion of the drill-head 7, asshown at 14, and formed on one side of said drilland the followingstatement thereof.

head is a transverse slot 15, with which the longitudinal slot 11 in theshaft or body portion of the drill orbit communicates.

The lower end of the lever 12 is provided with an outwardly-directedreaming-head 16,

and said lever is provided with an upwardlydirected arm 17, betweenwhich and the inner back wall of the slot 11 is mounted a spring 18,which is adapted to force the upper end of said lever outwardly and thehead 16 thereof inwardly.

Secured centrally of the shaft of the drill or bit is a cylindrical head19, which is held in place by a set-screw 20, and formed in the upperside thereof, around the shaft of the drill or bit, is an annularchamber21, in which is mounted a spiral spring 22, and above said springis a disk or plate 23, which is movably mounted on the shaft of thedrill or bit and which is provided with a depending tubular sleeve 24,which is also inclosed by the spring 22, and passing transverselythrough the shaft of the drill or bit, above said disk or plate, is apin 25, which limits the upward movement thereof.

Formed in one side of the inner wall of the cylindrical head 19 is aslot 26, which is adapted to receive the upper end of the lever 12 orthe arm 17 thereof, and the wall of said slot is upwardly and inwardlyinclined, and the outer side of the arm 17 of the lever 12 is similarlyformed, and when the disk or plate 23 is depressed the sleeve 24 strikesupon the outer surface of the arm 17 and forces it i11- wardly againstthe operation of the spring 18, and this movement forces thecutting-head 16 of the lever 12 outwardly, and said lever constitutesthe reamer by which the hole or opening is enlarged or the side wallsthereof cut out.

The operation will be readily understood fromthe foregoing descriptionwhen taken in connection with the accompanying drawings It will beunderstood that the drill or bit is to be connected with a brace orstock in the usual manner and operated similar to other devices of thisclass, and when the hole has been properly formed and it is desired tocut out the side walls thereof and enlarge the same the disk or plate 23is depressed in any desired manner, either by pressing thereon with thefingers or otherwise, and this operation throws the cutting-head 16of-the lever 12 outwardly, and said cutting-head enlarges the hole oropening or reams out the side walls thereof, as will be readilyunderstood.

It Will be apparent that the cutting-head 16 may be of any desiredshape, and in Fig. 4 I have shown a slightly-modified form ofconstruction in which the vertical slot through the drill-head intowhich the reaming-head f the lever 12 projects is extended entirelythrough said drill-head, and by means of this construction the sidewalls of the hole or opening may be cut out adjacent to the bottomthereof. When the hole has been properly reamed out or enlarged, thepressure on the disk or'plate 23 is removed, andthe spring 22 raises thesame, and the spring 18 throws out the upper end of the lever 12 andwithdraws the reaming-head 16 thereof, and the drill-head maythen beremoved from the hole, as will be readily understood.

This device is simple in construction and operation and comparativelyinexpensive, while being perfectly adapted to accomplish the result forwhich it is intended, and it is evident that changes in andmodifications of the construction herein described may be made withoutdeparting from the spirit of my invention or sacrificing its advantages.

Having fully described my invention, I clain as new and desire to secureby Letters Patent 1. A drill or bit comprising a shaft on the lower endof Which is formed a drill-head,

said shaft being provided in one side with a longitudinal slot whichextends downwardly into said head, a lever pivotally mounted in saidslot, and provided at its lower end with a reamer-head which extendsinto the slot formed in the drillhead, and means connected with theshaft of the drill for throwing out the lower end of said lever, and thereamerhead while the drill or bit is in operation, consisting of a headmounted on said shaft, and a movable spring-supported plate mountedabove said head, and said plate being provided with a depending sleeveor collar which is adapted to force the upper end of said leverinwardly, substantially as shown and described.

2. A drill or bit comprising a shaft on the lower end of which is formeda drill-head, said shaft being provided in one side with a longitudinalslot which extends downwardly into said head, a lever pivotally mountedin said slot, and provided at its lower end with a reamer-head whichextends into the slot formed in the drill-head, and means connected withthe shaft of the drill for throwing out the lower end of said lever, andthe reamerhead while the drill or bit is in operation, consisting of ahead mounted on said shaft, and a movable spring-supported plate mountedabove said head, and said plate being pro-' vided with a dependingsleeve or collar which is adapted to force the upper end of said leverinwardly, and said shaft and lever being provided with a spring which isadapted to force the upper end of said lever outwardly, substantially asshown and described.

In testimony that I claim the foregoing as my invention 1 have signed myname, in presence of the subscribing witnesses, this 29th day of May,1896.

THOMAS H. ANNABLE.

WVitnesses:

'0. GERsT,

O. B. RHEDEs.

